1 /*
2 * Copyright 1995-2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package java.net;
27
28 import java.io.FileDescriptor;
29 import java.io.FileOutputStream;
30 import java.io.IOException;
31 import java.nio.channels.FileChannel;
32
33 /**
34 * This stream extends FileOutputStream to implement a
35 * SocketOutputStream. Note that this class should <b>NOT</b> be
36 * public.
37 *
38 * @author Jonathan Payne
39 * @author Arthur van Hoff
40 */
41 class SocketOutputStream extends FileOutputStream
42 {
43 static {
44 init();
45 }
46
47 private AbstractPlainSocketImpl impl = null;
48 private byte temp[] = new byte[1];
49 private Socket socket = null;
50
51 /**
52 * Creates a new SocketOutputStream. Can only be called
53 * by a Socket. This method needs to hang on to the owner Socket so
54 * that the fd will not be closed.
55 * @param impl the socket output stream inplemented
56 */
57 SocketOutputStream(AbstractPlainSocketImpl impl) throws IOException {
58 super(impl.getFileDescriptor());
59 this.impl = impl;
60 socket = impl.getSocket();
61 }
62
63 /**
64 * Returns the unique {@link java.nio.channels.FileChannel FileChannel}
65 * object associated with this file output stream. </p>
66 *
67 * The <code>getChannel</code> method of <code>SocketOutputStream</code>
68 * returns <code>null</code> since it is a socket based stream.</p>
69 *
70 * @return the file channel associated with this file output stream
71 *
72 * @since 1.4
73 * @spec JSR-51
74 */
75 public final FileChannel getChannel() {
76 return null;
77 }
78
79 /**
80 * Writes to the socket.
81 * @param fd the FileDescriptor
82 * @param b the data to be written
83 * @param off the start offset in the data
84 * @param len the number of bytes that are written
85 * @exception IOException If an I/O error has occurred.
86 */
87 private native void socketWrite0(FileDescriptor fd, byte[] b, int off,
88 int len) throws IOException;
89
90 /**
91 * Writes to the socket with appropriate locking of the
92 * FileDescriptor.
93 * @param b the data to be written
94 * @param off the start offset in the data
95 * @param len the number of bytes that are written
96 * @exception IOException If an I/O error has occurred.
97 */
98 private void socketWrite(byte b[], int off, int len) throws IOException {
99
100 if (len <= 0 || off < 0 || off + len > b.length) {
101 if (len == 0) {
102 return;
103 }
104 throw new ArrayIndexOutOfBoundsException();
105 }
106
107 FileDescriptor fd = impl.acquireFD();
108 try {
109 socketWrite0(fd, b, off, len);
110 } catch (SocketException se) {
111 if (se instanceof sun.net.ConnectionResetException) {
112 impl.setConnectionResetPending();
113 se = new SocketException("Connection reset");
114 }
115 if (impl.isClosedOrPending()) {
116 throw new SocketException("Socket closed");
117 } else {
118 throw se;
119 }
120 } finally {
121 impl.releaseFD();
122 }
123 }
124
125 /**
126 * Writes a byte to the socket.
127 * @param b the data to be written
128 * @exception IOException If an I/O error has occurred.
129 */
130 public void write(int b) throws IOException {
131 temp[0] = (byte)b;
132 socketWrite(temp, 0, 1);
133 }
134
135 /**
136 * Writes the contents of the buffer <i>b</i> to the socket.
137 * @param b the data to be written
138 * @exception SocketException If an I/O error has occurred.
139 */
140 public void write(byte b[]) throws IOException {
141 socketWrite(b, 0, b.length);
142 }
143
144 /**
145 * Writes <i>length</i> bytes from buffer <i>b</i> starting at
146 * offset <i>len</i>.
147 * @param b the data to be written
148 * @param off the start offset in the data
149 * @param len the number of bytes that are written
150 * @exception SocketException If an I/O error has occurred.
151 */
152 public void write(byte b[], int off, int len) throws IOException {
153 socketWrite(b, off, len);
154 }
155
156 /**
157 * Closes the stream.
158 */
159 private boolean closing = false;
160 public void close() throws IOException {
161 // Prevent recursion. See BugId 4484411
162 if (closing)
163 return;
164 closing = true;
165 if (socket != null) {
166 if (!socket.isClosed())
167 socket.close();
168 } else
169 impl.close();
170 closing = false;
171 }
172
173 /**
174 * Overrides finalize, the fd is closed by the Socket.
175 */
176 protected void finalize() {}
177
178 /**
179 * Perform class load-time initializations.
180 */
181 private native static void init();
182
183 }
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